JPS5893995A - Casing for fluid machine - Google Patents

Abstract

PURPOSE:To enhance the pumping efficiency by recessing reinforcements in the external casing, providing a smooth configuration with the aid of an internal casing molded as in a single piece, and thereby lessening the fluid friction. CONSTITUTION:Because the radius of the cylindrical part 16 at the suction hole 2 of an external casing 14 is large, adhesive force can retain this cylindrical part 16. The inner walls of the internal pump room 3 sustains more fluid pressure than the part fitted with a liner ring 12, and because the spiral part 11 and its sides and the cylindrical part 17 at the discharge hole 5 receive inner pressures, the external casing 14 can oppose together with casing reinforcements 15 through the internal casing 1. Therefore this can be provided with a smooth configuration because of solid forming of this internal casing 1 in a single piece to give a lessened fluid friction, and thus the pumping efficiency can be enhanced.

Description

[Detailed description of the invention] Concerning casings for water turbines, water turbines, etc.

Conventionally, the casings of pumps, water turbines, etc. have been mainly made of cast iron, but recently, the number of casings made of iron plates is increasing. In the past, there were items made of concrete that were made of materials other than these.

If cast iron is used, the material cost is high. Because it is heavy, it is not suitable if the product is portable, and there are problems such as high transportation costs when handling the material.Those made of steel plates are pressed on small machines, but press distortion must be taken into account. There are technical difficulties involved in processing the material. Press-made ones have low rigidity and are easily distorted by external forces, so they are limited to small sizes.

If it is made of iron plate, there are problems such as the possibility of generating vibration noise. Additionally, concrete water turbines are extremely large and must be constructed on-site at the installation site, so they are generally not suitable.

On the other hand, resource conservation has become a hot topic in recent years, and the limited availability of raw materials has actually led to competition for resources, and it is not foreseeable that the current cast iron, iron plates, etc. will be sufficiently supplied in the future.

The present invention was made against the above background, and an object of the present invention is to provide a casing for a fluid machine that is corrosion resistant, generates little vibration and noise, and is lightweight.

The present invention is equipped with a thin foil inner wall film that forms a fluid action space between the inlet side where fluid flows in and the outlet side where fluid flows out, and is made of a material such as plastic concrete that closely adheres to the outer surface of the inner wall film. It consists of an outer casing containing a metal core.

Hereinafter, the present invention will be described in detail with reference to the drawings. The example is a horizontal centrifugal pump, but the invention is not limited thereto. FIG. 1 is a side view partially shown as a vertical sectional view, and FIG. 1 is a sectional view taken along the line AA in FIG.

The inner casing forms the inner wall film of the pump, and has a suction port Y, a pump chamber 3, which is a space for housing the impeller in the figure, and a discharge port S. The inner casing has a cylindrical portion having an inner diameter that is the same as the inner diameter of the intermediate casing 7 and is open in contact with the end of the intermediate casing 7. Around the outer periphery of the impeller is a spiral part. A liner ring 7.2 is fitted into the inner casing on the outer periphery of the suction port between the suction port and the pump chamber 3 to provide a water seal between the suction port and the boss of the impeller bow.

The inner casing 1 is selected to have corrosion resistance and wear resistance suitable for the fluid on its fluid passage side, and to be blow-formable from the viewpoint of processing. Examples include thermoplastic resins, thermosetting resins, room temperature curable resins, plastic composite materials, glass fiber reinforced resins, and the like.

Suction port, discharge port S and cylindrical part of inner casing/? The inner openings are opened respectively so that the outer casing/II is in close contact with the outer surface of the inner casing l and the inner casing/
is covered. The outer casing/4' has an extremely simple outer shape and is made of concrete material. Particularly in the case of a small and lightweight pump as in this embodiment, plastic concrete is suitable. A casing reinforcing material/S is embedded in the outer casing cover. The casing reinforcing material 15 is an outer circumferential plate having a simple shape that follows the outer shape of the outer casing, as shown in FIGS. 1 and 2.
It is a container-shaped thing consisting of A and a side plate /jB, and is interposed between the outer shape of the outer casing (3) and the inner casing l, and the end of the outer peripheral plate /jA appears from the outer casing /41. A cylindrical portion /A forming the suction port and a cylindrical portion /7 forming the discharge port S are inserted through the surface of the casing reinforcing member /3.

The casing reinforcing material/S maintains the strength and rigidity of the entire casing, and is made of, for example, a perforated iron plate, an iron plate, a wire mesh, or a synthetic resin.

A nut member /g is welded to the casing reinforcing material 15 and embedded in the outer casing /41 around the cylindrical part / 6 of the suction port and the cylindrical part / of the discharge port S, and the suction pipe,
It can be connected to the discharge piping.

The intermediate casing 7 is made of the same material as the outer casing/da, and fits into the fitting part/3 slightly outside the outer circumferential plate 15A of the casing reinforcing material/S and the inner periphery of the casing reinforcing material 15. An adhesive is interposed between the surface S that contacts the outer casing /Q at S, and the surface S that contacts the outer casing /4 (and the fitting portion /3).

(Da) The casing cover 6 that fits into the fitting part g of the intermediate casing 7 is made of a press, and the motor bracket is further fitted into the cover 6, and the bolt holes of the bracket 9,
A bolt Jθ is inserted through the bolt hole of the cover 6 and screwed into a tapped hole of the intermediate casing 7.

The outer casing is reinforced by a casing reinforcement 15 to carry the internal pressure applied to the inner casing. Since negative pressure is also applied as the fluid pressure of the inner casing/, there is adhesive strength with the inner casing/, and although the outer casing/41 requires strength and rigidity equivalent to its own structure, it is reinforced by the casing reinforcing material 15. For example, cement,
Concrete mainly consists of cement, plastic concrete, ie, polymer cement concrete, polymer-impregnated concrete, resin concrete, or concrete with sand or the like added as an extender.

The pump shaft 23, which is integrated with the motor shaft, is rotatably supported so as not to move in the axial direction by being supported by a bearing λ fitted into the bracket 19 and a bearing fitted into a not-shown bearing held by the end bracket of the motor. A shaft sealing collar 14Z is fitted and fixed to the pump shaft 3 outside the motor, and the pump shaft 23 enters the pump chamber 3 and is connected to the shaft sealing device 2S installed between the casing cover 6 and the shaft sealing collar 14Z. The taper part of the pump shaft 23 is sealed with an impeller at the tip: 1.
7A, and is fixed by screwing a nut 2A onto the male thread at the tip of the pump shaft 3. The rotating parts, supporting parts, and shaft sealing parts of these impellers are known.

When the motor is energized, the pump shaft 23 rotates and the impeller rotates. The liquid sucked through the suction port is accelerated and pressurized by the impeller, the pressure is recovered in the swirl chamber, and the liquid is discharged from the discharge port 5.

The negative pressure applied to the inner periphery of the suction loco tries to crush the inner casing at that part, but the outer casing is stuck and the radial direction of the cylindrical part l of the suction port on the outer casing Since the dimensions are dog-sized, the cylindrical portion/6 of the suction port is held by the adhesive force. The inner wall of the pump chamber 3 inside the part where the liner ring/2 is fitted receives fluid pressure,
Since the spiral portion, its side surface, and the cylindrical portion of the discharge port S each receive internal pressure, the outer casing opposes the casing reinforcing member 15 via the inner casing.

As described above, according to the fluid machine casing of the present invention, the outer casing is placed in close contact with the inner casing made of synthetic resin, and the reinforcing material is embedded in the outer casing, so the inner casing is integrally molded and has a smooth shape. It can make fluid friction less and improve pump efficiency. Since the outer casing is thick and made of concrete material, it has a vibration distribution effect and generates little vibration noise. Since it is made of concrete, it is weather resistant and there is no risk of rusting when exposed to water. The inner casing can accommodate the working fluid by choosing a corrosion-resistant material. All of them are made of inexpensive materials, and the amount of iron used in the casing, which uses the most iron, is reduced. The inner casing, which has a complex shape, is hollow molded and is easy to manufacture because it is made of synthetic (7) resin. The casing reinforcement material has an extremely simple shape and is easy to manufacture.

[Brief explanation of drawings]

FIG. 1 is a side view showing a partial vertical sectional view of an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line AA in FIG. 7. /...Inner casing λe/Suction port 3...Pump chamber...Impeller! -・Discharge port 6・Fist casing cover ・・Intermediate casing zone・・Mating part T・・Cylinder part //・・Spiral part /・・・Liner ring /3ψ
Fitting part /4 (@fist outer casing /j...Casing reinforcing material /6...Cylindrical part /7...Cylindrical part 7g--Nut member /9...Bracket, 20...Bolt 2 pieces...
・Bearing λ3・・Pump shaft 2t・・Shaft seal collar 2s
...Shaft sealing device roller...nut. Patent applicant Ebara Corporation Agent Cl Arai) Figure 1

Claims (1)

[Claims] / A thin hollow synthetic resin inner casing equipped with a fluid inlet and outlet of a fluid machine, openings for assembling internal functional parts, and a shape forming a fluid action space, and an inner casing made of a thin, hollow synthetic resin that is equipped with an outer casing formed by closely fitting a reinforcing material in a concrete-based material;
A casing for a fluid machine comprising an outer casing outer shape and the reinforcing material interposed between an inner casing.